SECTION
MITL9105/911
O-096-350-NA
090-105-NA).
This monitor may be used to alert the Supervisor that
the system is on battery power (Wiring
-
Appendix C) by wiring it to a
contact monitor port (at the cross-connect field).
Reserve Battery Backup and Charger
6.06 The
SX-100
and SX-200 systems both accept a -48 Vdc source
fed to the terminals indicated on the terminal blocks shown in
Figures 6-2 and 6-3. The installation of the reserve supply in the
system is described in
MITL9105/91
lo-096-200-NA.
A pictorial view of
the power supply is shown in Figures 6-2 and 6-4. The MITEL reserve
battery and charger (MITEL Part Number
9110-014-OOO-NA)
has an
OOT circuit which may be used to alert the Supervisor that the system
is on reserve battery power. The indicator is a dry relay contact that
may be used to ring an external alarm or it may be wired to a system
port as a Contact Monitor.
Fusing
6.07 The SX-200 system is protected by fuses which are located on
the back door of the cabinet (Figure 6-4). The back door has
imprinted upon it a circuit description defining each fuse and the
circuit breaker. In addition to these fuses there are a series of
LEDs
which also are defined by the circuit on the back door. These
LEDs
will
be lit if there is power in the area that they designate, or in the case of
the reserve battery backup, if the battery is connected. In addition to
the cabinet door fuses, there are fuses located on the backplane,
Interconnect card and Power Fail Transfer card. The fuse on the Inter-
connect card protects the console’s -48 Vdc and the fuse on the
power fail transfer card protects the power fail transfer -48 Vdc.
(a) The SX-100 system has the same backplane as the SX-200;
hence the same fusing appears on the backplane. There are
three fuses on the Interconnect card for: user 90
Vat,
user -48
Vdc and the console
-
48 Vdc (Figure 6-3). The front panel of
the power supply has two circuit breakers: one is for the DC
battery supply and the other is for the AC supply (Figure 6-l).
Note:
Some early versions of the
SX-lOO/SX-200
system do not
have all the fusing of later models. This point
stiould
be taken
into account when troubleshooting the system.
(b)
If the system is equipped with a reserve battery backup, sepa-
rate fusing is included in the charger unit itself (Figure 6-6).
There are three fuses: a 1 amp charging fuse, a 5 amp output
fuse and a 2 amp AC fuse. In addition, there are two 20 amp
circuit breakers (one on the battery pack, one on the charger
unit) for the battery protection. All reserve battery and charger
connections are shown in Figure 6-2 and Figure 6-3. Installa-
tion of the reserve battery backup is described in Section
MITLS
105/9
11
O-096-200-NA.
Page 73
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